Radiation Effects in Flow through Porous Medium over a Rotating Disk with Variable Fluid Properties

The present study investigates the radiation effects in flow through porous medium over a permeable rotating disk with velocity slip and temperature jump. Fluid properties density(ρ), viscosity(μ), and thermal conductivity(κ)are taken to be dependent on temperature. Particular case considering these fluid properties’ constant is also discussed. The governing partial differential equations are converted into nonlinear normal differential equation using similarity alterations. Transformed system of equations is solved numerically by using Runge-Kutta method with shooting technique. Effects of various parameters such as porosity parameterK, suction parameterWs, rotational Reynolds number Re, Knudsen number Kn, Prandtl number Pr, radiation parameterN, and relative temperature difference parameterεon velocity profiles along radial, tangential, and axial direction and temperature distribution are investigated for both variable fluid properties and constant fluid properties. Results obtained are analyzed and depicted through graphs and table.

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The Importance of Nanoparticles Addition in a Base Fluid Flow through a Porous Medium

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.8-9.225 ◽

2013 ◽

Vol 8-9 ◽

pp. 225-234

Author(s):

Dalia Sabina Cimpean

Keyword(s):

Porous Medium ◽

Fluid Flow ◽

Boundary Conditions ◽

Mixed Convection ◽

Mathematical Models ◽

Base Fluid ◽

Porous Matrix ◽

Fluid Properties ◽

Flow Through ◽

Energy Equations

The present study is focused on the mixed convection fluid flow through a porous medium, when a different amount of nanoparticles is added in the base fluid. The nanofluid saturates the porous matrix and different situations of the flow between two walls are presented and discussed. Alternatively mathematical models are presented and discussed. A solution of a system which contains the momentum, Darcy and energy equations, together with the boundary conditions involved, is given. The behavior of different nanofluids, such thatAu-water, Ag-waterandFe-wateris graphically illustrated and compared with the previous results.The research target is to observe the substantial increase of the thermophysical fluid properties, when the porous medium issaturated by a nanofluid instead of a classical Newtonian fluid.

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Analysis of MHD Forced Convective Flow of Variable Fluid Properties over a Saturated Porous Medium with Thermal Radiation Effect

International Frontier Science Letters ◽

10.18052/www.scipress.com/ifsl.9.47 ◽

2016 ◽

Vol 9 ◽

pp. 47-65 ◽

Cited By ~ 1

Author(s):

Kolawole Sunday Adegbie ◽

Adeyemi Isaiah Fagbade

Keyword(s):

Porous Medium ◽

Heat Loss ◽

Convective Flow ◽

Radiative Heat ◽

Saturated Porous Medium ◽

Fluid Velocity ◽

Radiative Heat Loss ◽

Variable Fluid Properties ◽

Fluid Properties ◽

Forced Convective Flow

The present paper addresses the problem of MHD forced convective flow in a fluid saturated porous medium with Brinkman-Forchheimer model, which is an important physical phenomena in engineering applications. The paper extends the previous models to account for effects of variable fluid properties on the forced convective flow through a porous medium in the presence of radiative heat loss using bivariate spectral relaxation method (BSRM). The dynamic viscosity and thermal conductivity of the newtonian fluid are assumed to vary linearly respectively, with temperature whereas the contribution of thermal radiative heat loss is based on Rosseland diffussion approximation. The flow model is described and expressed in form of a highly coupled nonlinear system of partial differential equations. The method of solution BSRM as proposed by Motsa [25] seeks to decouple the original system of PDEs to form a sequence of equations that can be solved in a computationally efficient manner. BSRM is an approach that applies spectral collocation independently in all underlying independent variable is executed to obtain approximate solutions of the problem. The proposed algorithm is supposed to be a very accurate, convergent and very effective in generating numerical results. The results obtained show a significant effects of the flow control parameters on the fluid velocity and temperature respectively. Consequently, the wall shear stress and local heat transfer rate of the present paper are compared with the available results in literatures. Remarkable impacts and a good agreement are found.

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